title: Rapid on-site evaluation reduces needle passes in endoscopic ultrasound-guided fine-needle aspiration for solid pancreatic lesions: a risk-benefit analysis.
abstract: BACKGROUND
  The effectiveness of endoscopic ultrasound-guided fine-needle aspiration increases with the number of needle passes but needle passes are also associated with increased risk of adverse events. The trade-off between needle passes and adequacy has not been well-characterized.
  
  
  OBJECTIVE
  The purpose of this study was to compare the risk-benefit tradeoff of different sampling protocols with and without rapid onsite evaluation (ROSE).
  
  
  METHODS
  We used a discrete-event simulation model to compare eight different sampling protocols. Each sampling protocol was simulated 10,000 times to obtain the average performance for each scenario. The per-pass adequacy rates, ROSE, accuracy of the assessor and sampling limits were varied to determine the impact of these factors on the number of needle passes and adequacy rates.
  
  
  RESULTS
  Increasing per-class adequacy can be achieved at a cost of increased needle passes. Sampling with ROSE achieved higher adequacy with fewer needle passes than policies using a fixed number of needle passes without ROSE.
  
  
  CONCLUSIONS
  Variable sampling policies using ROSE generally achieve greater per-case adequacy with fewer needle passes than non-ROSE sampling policies using a fixed number of passes.
authors.affiliation: Department of Pathology, University of Utah School of Medicine, Salt Lake City, UT, USA.
authors.forename: Robert L
authors.initials: RL
authors.lastname: Schmidt
authors.forename: Brandon S
authors.initials: BS
authors.lastname: Walker
authors.forename: Kirsten
authors.initials: K
authors.lastname: Howard
authors.forename: Lester J
authors.initials: LJ
authors.lastname: Layfield
authors.forename: Douglas G
authors.initials: DG
authors.lastname: Adler
mesh_terms: D001499:Bayes Theorem; D061765:Endoscopic Ultrasound-Guided Fine Needle Aspiration / Q000379:methods*; D006801:Humans; D010190:Pancreatic Neoplasms / Q000175:diagnosis / Q000473:pathology*; D012680:Sensitivity and Specificity